Add google-endpoints to third_party/.

third_party/google-endpoints/google/api/auth/caches.py

+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Defines a dogpile in-memory cache backend that supports size management."""
+
+from dogpile.cache import api
+import pylru
+
+
+class LruBackend(api.CacheBackend):
+  """A dogpile.cache backend that uses LRU as the size management."""
+
+  def __init__(self, options):
+    """Initializes an LruBackend.
+
+    Args:
+      options: a dictionary that contains configuration options.
+    """
+    capacity = options["capacity"] if "capacity" in options else 200
+    self._cache = pylru.lrucache(capacity)
+
+  def get(self, key):
+    return self._cache[key] if key in self._cache else api.NO_VALUE
+
+  def set(self, key, value):
+    self._cache[key] = value
+
+  def delete(self, key):
+    del self._cache[key]